Back at it again with a pad in a pen going in like I came home
You see what I did there?
“Back at it again with a pad in a pen” means he’s writing verses. In addition, however, “in a pen” can mean “in a penitentiary” and when a rapper “comes home” from a penitentiary, he has to “go in” hard to make up for lost time. To “go in” also means to go to prison, so he’s displaying verbal irony by saying “Going in like I came home.”
See what he did there?
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